engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Mathematics Three Dimensional Geometry Angle with Planes
What is the cosine of angle between the planes x + y + z + 1 = 0 and 2x - 2y + 2z + 1 = 0?
1
1/2
2
1/3
3
2/3
4
\(\frac{1}{4}\)